Newby question. Will a topper from an 06 crew cab fit an 08 crew cab? Would any year after 05 fit? What about gen 2 crew cab toppers?

 

Any 3rd gen topper will fit. 2nd gen will fit but due to the bed taper, it will overhang in the back sides by about 1/2" and be set in about 1/2" at the front. I had a 2nd gen topper on my 05. Fits the internal dimensions of the bed just fine. You can see the overhang in this pic. Welcome to the forum.

 

Thanks for the info and thanks for the welcome.